What intervention should a nurse consider for an adult patient with hyperthyroidism and presenting signs of cardiovascular complications?

Rationale: A. Patients with hyperthyroidism often experience tachycardia, palpitations, and arrhythmias. Vigorous exercise would increase cardiac workload, potentially worsening cardiovascular complications such as atrial fibrillation or heart failure. Gentle activity may be appropriate, but vigorous exercise is contraindicated in acute hyperthyroid states. B. Hyperthyroidism is caused by excess thyroid hormone, so increasing medication would worsen symptoms, including cardiovascular effects. The goal is to reduce thyroid hormone activity, not increase it. C. While iodine can be used therapeutically in specific settings (e.g., preoperative preparation for thyroid surgery), indiscriminate intake can exacerbate hyperthyroidism. Nutritional management alone does not address cardiovascular complications. D. Beta-blockers, such as propranolol, are commonly used in hyperthyroid patients to control tachycardia, palpitations, and hypertension, providing symptomatic relief while definitive therapy (antithyroid medications, radioactive iodine, or surgery) is planned. Beta-blockers reduce cardiac workload and help prevent complications such as arrhythmias and heart failure.